Apical versus Basal Neurogenesis Directs Cortical Interneuron Subclass Fate

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Neuronal diversity in the mammalian telencephalon is crucial for brain function and linked to neuropsychiatric diseases.
• Research often focuses on progenitor diversity in spatial and temporal domains, overlooking the role of neurogenesis location.
• The influence of neurogenesis site on neuronal fate determination remains underexplored.

Purpose of the Study:

• To investigate whether the location of neurogenesis within a fate-restricted domain instructs distinct neuronal fates.
• To determine if apical versus basal neurogenesis influences the fate determination of cortical interneurons.

Main Methods:

• In vivo fate mapping techniques were employed.
• Manipulation of neurogenic location was performed to assess its impact on interneuron development.

Main Results:

• Apical neurogenesis predominantly yields somatostatin-expressing interneurons.
• Basal neurogenesis primarily results in parvalbvalbumin-expressing interneurons.
• Shifting neurogenic location altered interneuron subclass fate, confirming its instructive role.

Conclusions:

• Neurogenesis location is an instructive determinant of neuronal fate, specifically for cortical interneuron subclasses.
• This finding adds a new dimension to understanding the spatial-temporal regulation of neuronal fate determination.
• Results have implications for understanding brain development and neuropsychiatric disorders.